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Seismic data attenuation compensation method in synchronous extrusion transform domain

A synchronous extrusion and attenuation compensation technology, applied in the field of seismic exploration, can solve the problems of limiting time-frequency resolution, unfavorable attenuation compensation, and affecting time-frequency representation, etc., to achieve enhanced resolution, convenient reservoir description, and avoid noise amplification Effect

Active Publication Date: 2017-11-24
XI AN JIAOTONG UNIV
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Problems solved by technology

In general, the selection of the template function inevitably affects the time-frequency representation, and the uncertainty principle also limits the time-frequency resolution of the representation
In the resulting time-frequency representation, there is an obvious spread of time-frequency energy, which will not be conducive to accurate attenuation compensation for each frequency component

Method used

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  • Seismic data attenuation compensation method in synchronous extrusion transform domain
  • Seismic data attenuation compensation method in synchronous extrusion transform domain
  • Seismic data attenuation compensation method in synchronous extrusion transform domain

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Embodiment Construction

[0074] The present invention is described in further detail below in conjunction with accompanying drawing:

[0075] In the synchrosqueezing transform domain, the present invention utilizes the sparse nature of the signal in the synchrosqueezing transform domain, expresses the attenuation compensation process as an inverse problem with L1 norm regularization, and solves it by an iterative reweighting algorithm, So as to achieve stable attenuation compensation, as follows:

[0076] According to the wave field extrapolation theory, for the seismic trace s0(t) with attenuation, its time-frequency domain is expressed as S0(ω,τ), and the attenuation compensation process in the time-frequency domain can be described as:

[0077]

[0078] Among them, S(ω,τ) is the time-frequency representation of the attenuation-compensated signal, ω is the frequency, τ is the time, Λ(ω,τ) is the attenuation compensation operator, and Q is the predetermined medium quality factor.

[0079] The att...

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Abstract

The invention discloses a seismic data attenuation compensation method in a synchronous extrusion transform domain. In the synchronous extrusion transform domain, the attenuation compensation process is represented as an inverse problem with L1 norm regularization, solving is carried out through an iterative re-weighting algorithm, and thus, stabilized attenuation compensation is realized. Synchronous extrusion transform can suppress diffusion of time frequency energy, a more sparse and highly-localized time frequency representation is obtained, and thus, attenuation compensation on nonstationary seismic signals is facilitated. The method uses the sparse properties of signals in the synchronous extrusion transform domain, the L1 norm regularization method is introduced to stabilize the attenuation compensation process, and a noise amplification problem is thus avoided. The disclosed method is used to realize compensation on seismic attenuation effects, the seismic data resolution can be enhanced, and convenience is brought to subsequent seismic inversion and reservoir description.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a time-frequency domain attenuation compensation method for seismic data, in particular to a seismic data attenuation compensation method for synchronous squeeze transformation domain. Background technique [0002] During the propagation of seismic waves in the underground medium, due to the attenuation and dispersion effects of the medium, the amplitude of seismic waves will be reduced and the phase of wavelets will be distorted, thereby significantly reducing the resolution of seismic data. Attenuation and dispersion are generally expressed quantitatively by a frequency-independent quality factor Q. When this parameter is estimated, the attenuation and dispersion effects can be compensated, thereby improving the resolution of seismic data and facilitating subsequent interpretation. . [0003] At present, the compensation of attenuation and dispersion can be described...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28G01V2210/48
Inventor 高静怀张国伟王大兴
Owner XI AN JIAOTONG UNIV
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